Add switch-to-latest-gcc

Dockerfile-ubuntu2004

 RUN cp -prv /usr/lib/llvm-12/lib/libunwind.so.1.0 /usr/lib/llvm-12/lib/libunwind.so
 
 COPY switch-to-latest-clang /usr/local/bin/switch-to-latest-clang
+COPY switch-to-latest-gcc /usr/local/bin/switch-to-latest-gcc
 
 RUN chmod +x /usr/local/bin/switch-to-latest-clang
+RUN chmod +x /usr/local/bin/switch-to-latest-gcc
 
 RUN apt clean
 

Dockerfile-ubuntu2204

 RUN apt install -y mold
 
 COPY switch-to-latest-clang /usr/local/bin/switch-to-latest-clang
+COPY switch-to-latest-gcc /usr/local/bin/switch-to-latest-gcc
 
 RUN chmod +x /usr/local/bin/switch-to-latest-clang
+RUN chmod +x /usr/local/bin/switch-to-latest-gcc
 
 RUN apt clean
 

switch-to-latest-gcc

+#!/bin/bash
+
+set +e
+set -o pipefail
+
+# Assuming g++ and gcc are located in /usr/bin/
+update-alternatives --install /usr/bin/c++ c++ /usr/bin/g++ 50 > /tmp/.switch-to-g++.stdout
+update-alternatives --install /usr/bin/cc cc /usr/bin/gcc 50 >> /tmp/.switch-to-g++.stdout
+update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++ 50 >> /tmp/.switch-to-g++.stdout
+update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc 50 >> /tmp/.switch-to-g++.stdout
+# You might also want to update ld, depending on your requirements
+# update-alternatives --install /usr/bin/ld ld /path/to/your/ld 50 >> /tmp/.switch-to-g++.stdout
+
+echo "Compiler set to: $(readlink /etc/alternatives/c++)"
+